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In the first inning of his first game, the first pick in this year's Draft recorded his first hit as a pro, and then immediately proceeded to steal his first base.

It was, you might say, a day of firsts for Carlos Correa on Monday.

The Puerto-Rican born shortstop, who officially signed with Houston just days after the Astros tabbed him as the first overall selection in the 2012 Draft, went 1-for-5 with a walk in his professional debut as the Rookie-level Gulf Coast League Astros beat the Cardinals, 1-0, in 13 innings.

With one out in the bottom of the first, Correa batted a Silfredo Garcia offering into center field and then swiped second on Teoscar Hernandez's strikeout. He also committed an error in the sixth.

The 17-year-old graduated from the Puerto Rico Baseball Academy and High School on June 10. The Astros gave Correa, the first-ever No. 1 overall Draft pick from Puerto Rico, a $4.8 million signing bonus when he inked his deal with the team June 7.

"I'm just happy to be an Astro right now, and I just want to get to the big league level as quickly as I can," he said that day. "I want to be a leader and want to be the face of the franchise. I will work hard to be a great player, an impact player."

Another first-rounder from this year's Draft, Toronto's D.J. Davis, also debuted Monday, going 1-for-3 and playing left field in the GCL Blue Jays' 13-3 loss to the GCL Pirates. The Mississippi native, who turns 19 in just over a week, was drafted 17th overall by the Blue Jays out of Stone (Miss.) High School.

The Pirates' second-round pick, Wyatt Mathisen, went 3-for-5 with a double, a run scored and two RBIs in that same game. The 18-year-old catcher was picked with the 69th overall selection out of Calallen (Texas) High School. Stetson Allie, who was ranked as Pittsburgh's No. 5 overall prospect as a pitcher before the season, made his first appearance since converting to hitting, going 2-for-3 with a triple, two runs and an RBI while playing third base.

In the GCL Marlins' 6-1 win over the GCL Nationals, top Marlins prospect Christian Yelich went 1-for-4 in a rehab appearance. The Marlins' fourth-round pick, outfielder Austin Dean, went 1-for-4 as well.

Detroit third-rounder Austin Schotts went 3-for-4 with a double, a run and an RBI for the GCL Tigers in a 6-1 win over the GCL Phillies, while Baltimore third-rounder Adrian Marin went 1-for-4 with a run and an RBI in the GCL Orioles' 5-3 defeat of the GCL Twins.

Jonathan Raymond is a contributor to MLB.com. This story was not subject to the approval of the National Association of Professional Baseball Leagues or its clubs.